<template>
	<div class="wrapper">

		<!-- header部分 -->
		<header>
			<p>商家信息</p>
		</header>

		<!-- 商家logo部分 -->
		<div class="business-logo">
			<img :src="business.businessImg">
		</div>

		<!-- 商家信息部分 -->
		<div class="business-info">
			<h1>{{business.businessName}}</h1>
			<p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
			<p>{{business.businessExplain}}</p>
		</div>

		<!-- 食品列表部分 -->
		<ul class="food">
			<li v-for="(item,index) in foodArr">
				<div class="food-left">
					<img :src="item.foodImg">
					<div class="food-left-info">
						<h3>{{item.foodName}}</h3>
						<p>{{item.foodExplain}}</p>
						<p>&#165;{{item.foodPrice}}</p>
					</div>
				</div>
				<div class="food-right">
					<div>
						<i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity!=0"></i>
					</div>
					<p><span v-show="item.quantity!=0">{{item.quantity}}</span></p>
					<div>
						<i class="fa fa-plus-circle" @click="add(index)"></i>
					</div>
				</div>
			</li>
		</ul>
		<p>------------------------------------------------------</p>

		<!-- 购物车部分 -->
		<div class="cart">
			<div class="cart-left">
				<div class="cart-left-icon"
					:style="computedTotalQuantity()==0?'background-color:#505051;':'background-color:#3190E8;'">
					<i class="fa fa-shopping-cart"></i>
					<div class="cart-left-icon-quantity" v-show="computedTotalQuantity()!=0">{{computedTotalQuantity()}}
					</div>
				</div>
				<div class="cart-left-info">
					<p>&#165;{{computedTotalPrice()}}</p>
					<p>另需配送费{{business.deliveryPrice}}元</p>
				</div>
			</div>
			<div class="cart-right">
				<!-- 不够起送费 -->
				<div class="cart-right-item" v-show="computedTotalSettle()<business.starPrice"
					style="background-color: #535356;cursor: default;">
					&#165;{{business.starPrice}}起送
				</div>
				<!-- 达到起送费 -->
				<div class="cart-right-item" @click="toOrder" v-show="computedTotalSettle()>=business.starPrice">
					去结算
				</div>
			</div>
		</div>

	</div>
</template>

<script setup>
	import {
		ref,
		onMounted,
		getCurrentInstance
	} from 'vue';
	import {
		useRoute,
		useRouter
	} from 'vue-router';
	import axios from 'axios';
	import Footer from '../components/Footer.vue';
	import qs from 'qs'
	const {
		proxy
	} = getCurrentInstance();
	const route = useRoute();
	const router = useRouter();

	const businessId = route.query.businessId;
	const user = ref({});
	const business = ref(''); //????????
	const foodArr = ref([]);
	const totalPrice = ref(0);
	const totalQuantity = ref(0);

	onMounted(async () => {
		await getBusinessInfo();
		getUser();
		//user = sessionStorage.getItem('user');
		//alert(user);
	});

	function getUser() {
		user.value = proxy.$getSessionStorage('user');
		if (user.value !== null) {
			listCart();
		}
	}

	async function getBusinessInfo() {
		await axios.post('BusinessController/getBusinessById', qs.stringify({
			businessId
		})).then(response => {
			business.value = response.data;
		}).catch(error => {
			console.error(error);
		});
		foodArr.value = business.value.foodList.map(item => ({
			...item,
			quantity: 0
		}));
	}

	function listCart() {
		axios.post('CartController/listCart', qs.stringify({
			businessId,
			userId: user.value.userId
		})).then(response => {
			const cartArr = response.data;
			foodArr.value = foodArr.value.map(foodItem => {
				const cartItem = cartArr.find(item => item.foodId === foodItem.foodId);
				return {
					...foodItem,
					quantity: cartItem ? cartItem.quantity : 0
				};
			});
			foodArr.value.sort();
		}).catch(error => {
			console.error(error);
		});
	}

	function add(index) {
		if (user.value === null) {
			router.push({
				path: '/login'
			});
			return;
		}

		if (foodArr.value[index].quantity === 0) {
			saveCart(index);
		} else {
			updateCart(index, 1);
		}
	}

	function minus(index) {
		if (!user.value) {
			router.push({
				path: '/login'
			});
			return;
		}

		if (foodArr.value[index].quantity > 1) {
			updateCart(index, -1);
		} else {
			removeCart(index);
		}
	}

	function saveCart(index) {
		axios.post('CartController/saveCart', qs.stringify({
			businessId,
			userId: user.value.userId,
			foodId: foodArr.value[index].foodId
		})).then(response => {
			if (response.data === 1) {
				foodArr.value[index].quantity = 1;
				foodArr.value.sort();
			} else {
				alert('向购物车中添加食品失败！');
			}
		}).catch(error => {
			console.error(error);
		});
	}

	function updateCart(index, num) {
		axios.post('CartController/updateCart', qs.stringify({
			businessId,
			userId: user.value.userId,
			foodId: foodArr.value[index].foodId,
			quantity: foodArr.value[index].quantity + num
		})).then(response => {
			if (response.data === 1) {
				foodArr.value[index].quantity += num;
				foodArr.value.sort();
			} else {
				alert('向购物车中更新食品失败！');
			}
		}).catch(error => {
			console.error(error);
		});
	}

	function removeCart(index) {
		axios.post('CartController/removeCart', qs.stringify({
			businessId,
			userId: user.value.userId,
			foodId: foodArr.value[index].foodId
		})).then(response => {
			if (response.data === 1) {
				foodArr.value[index].quantity = 0;
				foodArr.value.sort();
			} else {
				alert('从购物车中删除食品失败！');
			}
		}).catch(error => {
			console.error(error);
		});
	}

	function toOrder() {
		router.push({
			path: '/orders',
			query: {
				businessId: business.value.businessId
			}
		});
	}

	// Computed properties
	const computedTotalPrice = () => {
		return foodArr.value.reduce((total, item) => total + item.foodPrice * item.quantity, 0);
	};

	const computedTotalQuantity = () => {
		return foodArr.value.reduce((total, item) => total + item.quantity, 0);
	};

	const computedTotalSettle = () => {
		return (computedTotalPrice() + business.value.deliveryPrice).toFixed(2);
	};
</script>

<style scoped>
	/****************** 总容器 ******************/
	.wrapper {
		width: 100%;
		height: 100%;
	}

	/****************** header部分 ******************/
	.wrapper header {
		width: 100%;
		height: 12vw;
		background-color: #0097FF;
		color: #fff;
		font-size: 4.8vw;

		position: fixed;
		left: 0;
		top: 0;
		z-index: 1000;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	/****************** 商家logo部分 ******************/
	.wrapper .business-logo {
		width: 100%;
		height: 35vw;
		/*使用上外边距避开header部分*/
		margin-top: 12vw;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-logo img {
		width: 40vw;
		height: 30vw;
		border-radius: 5px;
	}

	/****************** 商家信息部分 ******************/
	.wrapper .business-info {
		width: 100%;
		height: 20vw;

		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-info h1 {
		font-size: 5vw;
	}

	.wrapper .business-info p {
		font-size: 3vw;
		color: #666;
		margin-top: 1vw;
	}

	/****************** 食品列表部分 ******************/
	.wrapper .food {
		width: 100%;
		/*使用下外边距避开footer部分*/
		margin-bottom: 14vw;
	}

	.wrapper .food li {
		width: 100%;
		box-sizing: border-box;
		padding: 2.5vw;
		user-select: none;

		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-left {
		display: flex;
		align-items: center;
	}

	.wrapper .food li .food-left img {
		width: 20vw;
		height: 20vw;
	}

	.wrapper .food li .food-left .food-left-info {
		margin-left: 3vw;
	}

	.wrapper .food li .food-left .food-left-info h3 {
		font-size: 3.8vw;
		color: #555;
	}

	.wrapper .food li .food-left .food-left-info p {
		font-size: 3vw;
		color: #888;
		margin-top: 2vw;
	}

	.wrapper .food li .food-right {
		width: 16vw;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-right .fa-minus-circle {
		font-size: 5.5vw;
		color: #999;
		cursor: pointer;
	}

	.wrapper .food li .food-right p {
		font-size: 3.6vw;
		color: #333;
	}

	.wrapper .food li .food-right .fa-plus-circle {
		font-size: 5.5vw;
		color: #0097EF;
		cursor: pointer;
	}

	/****************** 购物车部分 ******************/
	.wrapper .cart {
		width: 100%;
		height: 14vw;

		position: fixed;
		left: 0;
		bottom: 0;

		display: flex;
	}

	.wrapper .cart .cart-left {
		flex: 2;
		background-color: #505051;
		display: flex;
	}

	.wrapper .cart .cart-left .cart-left-icon {
		width: 16vw;
		height: 16vw;
		box-sizing: border-box;
		border: solid 1.6vw #444;
		border-radius: 8vw;
		background-color: #3190E8;
		font-size: 7vw;
		color: #fff;

		display: flex;
		justify-content: center;
		align-items: center;

		margin-top: -4vw;
		margin-left: 3vw;

		position: relative;
	}

	.wrapper .cart .cart-left .cart-left-icon-quantity {
		width: 5vw;
		height: 5vw;
		border-radius: 2.5vw;
		background-color: red;
		color: #fff;
		font-size: 3.6vw;

		display: flex;
		justify-content: center;
		align-items: center;

		position: absolute;
		right: -1.5vw;
		top: -1.5vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:first-child {
		font-size: 4.5vw;
		color: #fff;
		margin-top: 1vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:last-child {
		font-size: 2.8vw;
		color: #AAA;
	}

	.wrapper .cart .cart-right {
		flex: 1;
	}

	/*达到起送费时的样式*/
	.wrapper .cart .cart-right .cart-right-item {
		width: 100%;
		height: 100%;
		background-color: #38CA73;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		cursor: pointer;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
	/*
	.wrapper .cart .cart-right .cart-right-item{
		width: 100%;
		height: 100%;
		background-color: #535356;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		
		display: flex;
		justify-content: center;
		align-items: center;
	}
	*/
</style>